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To solve for the measure of angle \( \angle 3 \) in the given diagram, let's first analyze the figure step-by-step.

We are given:
- \( \angle 1 = 50^\circ \)
- \( \angle 2 = 70^\circ \)
- The right angle in the triangle, which is \( 90^\circ \).

Looking at the triangle that includes \( \angle 1 \), \( \angle 2 \), and \( \angle 3 \), we can use the fact that the sum of angles in any triangle is \( 180^\circ \).

In the small triangle with angles \( \angle 2 \), \( 90^\circ \) (right angle), and \( \angle 3 \):
\[
\text{Sum of angles} = 180^\circ
\]
So,
\[
70^\circ + 90^\circ + \angle 3 = 180^\circ
\]

Now, solve for \( \angle 3 \):
\[
\angle 3 = 180^\circ - (70^\circ + 90^\circ) = 180^\circ - 160^\circ = 20^\circ
\]

But, since this is not in the options, let me double-check the interpretation of the angles:
**Angle 3 must be part of an external angle formed by the large angle at the base with line extensions**, as seen in some diagrams, meaning that to find the external measure, you need to subtract from that outside the triangle. I'll

What is the measure of angle 3 in the given triangle, where angle 1 is 50° and angle 2 is 70°?

Learn how to calculate the measure of angle 3 in a triangle where angle 1 is 50° and angle 2 is 70°. This problem involves geometry concepts such as the triangle angle sum and the exterior angle theorem. Suitable for students in Grades 8-10.

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